PDF malware analysis — malicious · 68001b30bf9b56fc

MALICIOUS

PDF

2.62 MB

MD5: 78872c6c87524e762cc7b7c796528ade SHA-1: 2bfb819440e1032650b4e9b628cbcf9b0f108181 SHA-256: 68001b30bf9b56fc94791f89701cc39eb529cc7b332d965dcc1aa5b9e3c4e8e4

84 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file is heavily obfuscated, indicated by the high stream count and the presence of encrypted content with JavaScript. The embedded JBIG2 streams are suspicious and likely used to conceal malicious code or a downloader. The PDF_ENCRYPTED_WITH_JS heuristic strongly suggests that JavaScript is used to decrypt and execute a payload, which is a common technique for delivering malware via malicious documents.

Machine Learning

Nyx PDF Classifier clean score 0.0005

Heuristics 5

Encrypted PDF carries /jS — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/jS). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
Unusually high stream count medium PDF_MANY_STREAMS

PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 32

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`jbig2_00_off00025181.bin` `811613e35bab6b93e3c0ddccd988b2a729a4295fbc1347fb8e34b9114f222de3`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x25181	4433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`jbig2_01_off0002643c.bin` `a21798a89a515f3a718eaebc6778f71d20c7f007a74d7f5c3e84160e101e8d23`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x2643C	4406 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`jbig2_02_off000276df.bin` `ece1710f61a7bce5dd6da20363149b148b51bab6fe61b4aae3a90ff790334d7f`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x276DF	4567 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_03_off00028a22.bin` `8c0316028f5176611967a5777430c2cbab3614224578efbb6b8980d4412cf0dd`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x28A22	4549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_04_off00029d54.bin` `de5a33306ffcf478ff11455434751fb654570070ec976feae6813722b9511246`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x29D54	4920 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_05_off0002b1f9.bin` `c8f10f49aae2cd6a4ef46b76a9a64c77a76a9dcd9fab87c65285326ca5e88bb9`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x2B1F9	5865 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`jbig2_06_off0002ca4f.bin` `f7f6c6d1180e63b344852e64f7b9d55608c8f8f0120dac8ff7c0848d8029bf5d`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x2CA4F	4541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`jbig2_07_off0002dd78.bin` `c7cd41254677380acb13a3f1f6bead56f6588216be5a8f0002d08e6a293d1d02`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x2DD78	4277 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_08_off0002ef99.bin` `aec6e2469f0534df46aed379899e3ec71d262c05c87880935fbaa9dec0ac4d5b`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x2EF99	1019 bytes
`jbig2_09_off0002f501.bin` `e8550d8a362cf52b0ff5487412339619139fa6b01123def52077571419fef94d`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x2F501	4812 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_10_off00030939.bin` `d49385ec3bd2b0cb41ac47d6976e55e116d392b1581b5bfcdd7f32172cab3507`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x30939	934 bytes
`jbig2_11_off00030e4b.bin` `c2392250cbb03e9c2d916e7fa0d20f41b46632738663922a186b326bc51fd484`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x30E4B	4994 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_12_off0003233a.bin` `93bc872ef676150dc86dc22fa7fe23832553fb766c58fefb70d0f0e6cc0bfc82`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x3233A	1020 bytes
`jbig2_13_off000328a2.bin` `7d9c29aab4af82a911bb7450bff73fed0c35d95f6f99cc174b06f841001c0db8`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x328A2	4449 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_14_off00033b6e.bin` `39470f27c21ccb1d4eb8c2cc3dce3f53ea8a01938276897264dc01d19b999434`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x33B6E	4380 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_15_off00034df5.bin` `f629d0822a6ae8dc31e466a25cb6daa349b3f8c138b01c2a0a78f6d315e6b447`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x34DF5	4530 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_16_off00036112.bin` `a1c0b759b33d5cb2b5bd37c1c07cfbd160b7202bedc95b1149d8d7b6fdec5846`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x36112	6178 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_17_off00037a9e.bin` `432501c6349213db84989e65f35208e6afdf387a30f332a4836e16e55fd1b359`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x37A9E	5044 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_18_off00038fbc.bin` `6788b8f4a276d3cd12971e2c92b368a7e909259678adb9f2f9f27b58a1970014`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x38FBC	5755 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.95, consistent with packed or encrypted content.
`jbig2_19_off0003a7a3.bin` `e2f9e2820fcbcb741a297c2360711c66173d0c6e4fcb2254e73db42e8d383e82`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x3A7A3	5293 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_20_off0003bdb9.bin` `04967d6e81e86643703b2066286c1f79cae0fb32f29914637ea39b038420ac9f`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x3BDB9	5992 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_21_off0003d68c.bin` `56b31a9824c909272f36dbf2b0f3c0156f37a6aef48dacd60020a978867317e1`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x3D68C	6094 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_22_off0003efc5.bin` `affadb9acdc72c4883d64b1fa56b47e3f72cccf6daf1a876e0f864d879c0a92a`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x3EFC5	6577 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`jbig2_23_off00040ae2.bin` `79d7932b39bd41d7a39c7be41cda0e220f85661100e24dd63886f7b0c8533a7e`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x40AE2	5213 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_24_off000420a9.bin` `1b4c5bcef6ac251078be0eca3439667b8608c3be0143c8dcf611a4a949cb2a49`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x420A9	6772 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`jbig2_25_off00043c89.bin` `6e65b32aca20bfdb335a23a08f3b4109f5e8ae31d93255fa75b1fdb7492f0947`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x43C89	5157 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`jbig2_26_off00045219.bin` `bc2e863574f7e96c87281ae0490ab876c5c248b0a71302cb6d52ef275b20465d`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x45219	2939 bytes
`jbig2_27_off00045eef.bin` `253a1dd91806e58b85c3e3b892d0ab9773c89c6bfa728aad185d6422ef65951c`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x45EEF	2729 bytes
`jbig2_28_off00046b03.bin` `64f65d77b93eca72c7c29d34ab95d808a37e64f29fc254504268f8c0ba1e442a`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x46B03	2779 bytes
`jbig2_29_off0004774a.bin` `71bc9b1635ef94c5234301d4cfa8abf626557b3d91f3d96889a28b27106a39a9`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x4774A	3209 bytes
`jbig2_30_off0004853f.bin` `088cb126c22e1ffcce4322eeeff6ac3817fc8c6df92f31044c4e534223be7ccc`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x4853F	3219 bytes
`jbig2_31_off0004933f.bin` `948306c4d657d08ec78cfff8c123c42a989761d1e236eafc3f86563d0847e3bf`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0x4933F	3533 bytes

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