PDF malware analysis — malicious · 7972285ed95bdda8

MALICIOUS

PDF

1.10 MB

MD5: 210876a7ef0e3585f0bd503751a024b2 SHA-1: b73ac0545fb09870417e7df14406c4619db0dbf7 SHA-256: 7972285ed95bdda87f42862c0dbf95ef91c0998650e98341d4b498ae59c13f78

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript and utilizes JBIG2 decoding with active content, indicating an attempt to execute malicious code. A ClamAV signature for 'Html.Exploit.IFrameBOF-1' was triggered on an extracted artifact, suggesting the presence of an exploit. The embedded JavaScript stream and the JBIG2 stream are the primary indicators of malicious intent, likely serving to download and execute a second-stage payload.

Heuristics 7

JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT

JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
JBIG2Decode filter medium PDF_JBIG2

JBIG2 image decoder present — historically used in zero-click exploits
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `0e5a0aeec4d269512e1a5de83fa3532854d9846401281881c5e9a357a0da3c5c`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	42649 bytes
Detection ClamAV: Html.Exploit.IFrameBOF-1 Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s).
`jbig2_00_off0000aa10.bin` `e43a10b7bfd65720eba2b911717cb6aa2f4da537c075b7b1d85b55b41559ecd8`	pdf-jbig2-stream	PDF JBIG2 stream at offset 0xAA10	1105727 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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