PDF malware analysis — malicious · 84980cd937209027

MALICIOUS

PDF

466.9 KB

MD5: 25c6d67cac8973c8016de8d04f6ef4de SHA-1: 5f0f43d203de11f7c6d03fe9c2a27d0ac3048ba8 SHA-256: 84980cd937209027e166f877ea609f4ab492b756c5053ba4aa8a586ccf12bfe7

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability. Static analysis indicates this JavaScript is designed to download and execute a secondary payload. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack. The exact nature of the second-stage payload is not determined from this analysis, but the exploit chain is clear.

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 4

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 0x109	916 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `7a590a04ea87350e84c3856974289b971d37449302c9c2940b4de6ef81f0d52b`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x24C4	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 0x24C4	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_sfnt_off0007043e.bin` `2722878b19761e7a433e1ca6f32e7f9fe9cccce4136877b3beb9040f23bd4b18`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7043E	23432 bytes

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