PDF malware analysis — malicious · 1d4d9c0c750acb81

MALICIOUS

PDF

82.2 KB

MD5: 3bfcd1b9e1416ff74d8b27b2fa112eca SHA-1: 5635afbad0dc7599c152c53eba08efdc54207826 SHA-256: 1d4d9c0c750acb81fc37e87303eaafbfab514713b710f2276337be2a5795c0a5

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The critical heuristic firing for CVE-2007-5659 indicates the PDF exploits a known vulnerability using embedded JavaScript. The extracted JavaScript streams, particularly 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', suggest the script is designed to download and execute a second-stage payload. The use of 'String.fromCharCode' and obfuscated JavaScript further supports this. The document body was not sufficiently readable to determine a specific lure.

Heuristics 5

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `f048286b2dfe205330e162117bc9e2e9406092389e25aa91660890d79cb205b6`	pdf-javascript-stream	PDF /JS object 5 at offset 0x110	916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_009_off0000f58d.bin` `4ed68ae454e8bd4815011aa83749c9ac895e19d492642c3a660560b56f217cf3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF58D	6570 bytes
`legacy_pdfkit_stage_000.js` `7a590a04ea87350e84c3856974289b971d37449302c9c2940b4de6ef81f0d52b`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x65F7	4919 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `79371305d462f00f2a141b476e1cf8fba05bdb49c15d53c9a49ff740e927b262`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x65F7	11601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`font_00_cff_off0000e37c.bin` `85bdf667194bcc4cacabbad33dea4a6f924067c81bc4a463d6b90f88c72528b4`	pdf-font-stream	PDF embedded font (cff) at offset 0xE37C	5341 bytes
`font_02_cff_off00011bc5.bin` `83bfeb19b0c4845db32df4914d0b83fe1d3d21784ac5d9c0c916787b851525a4`	pdf-font-stream	PDF embedded font (cff) at offset 0x11BC5	329 bytes
`font_03_cff_off00011d3e.bin` `20308b2cca49ca179f467f29338da0f479585f14815552fe9db3039ad7d4073c`	pdf-font-stream	PDF embedded font (cff) at offset 0x11D3E	3751 bytes
`font_04_cff_off00012a0b.bin` `ec977c241b825056648add2158f96580faddbc4d82f6db4f8faffc3a8702459b`	pdf-font-stream	PDF embedded font (cff) at offset 0x12A0B	572 bytes
`font_05_sfnt_off00012c0c.bin` `0af9dc2b6aa385b71ff540fdc244c5f726b15704f60415611b21f85c4fd688ee`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C0C	21780 bytes

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