PDF malware analysis — malicious · f971bc14284f15c9

MALICIOUS

PDF

7.1 KB

MD5: 855dd3cb98968a2421188efc5eba1337 SHA-1: 8c4abdf59a42e00ed625e671fe9721cfa9eb4f52 SHA-256: f971bc14284f15c908cbc52a32f120ea6bf52aaf9bb47ad8a974db916042fb02

308 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and exhibits characteristics of the CVE-2008-2992 exploit, indicated by the 'util.printf' firing. A secondary embedded PDF was also detected with similar suspicious findings. The embedded JavaScript stream, named 'javascript_obj0006_000.js', is likely responsible for executing the malicious payload.

Heuristics 10

util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Remote GoTo action info PDF_GOTO_REMOTE

PDF has GoToR/GoToE actions that reference sibling document files — typical of multi-part document bundles
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0005.bin` `f99d534c7c36b8ef57f9aa9326499763e9de9941a1d84332bc40f2511e50e50d`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1C5	6081 bytes
Detection ClamAV: Heuristics.PDF.ObfuscatedNameObject Obfuscation or payload: unlikely
`javascript_obj0006_000.js` `c65eb17492bfa3c6397f86c13c2f384bf6ea582957b110f263a9ac842889c36d`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1A7	5107 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`polyglot_child_pdf_off000001c5.pdf` `fbc54a804c7b704e2baa994c2955a2e4124de54490fd5f202083a76a0c8990a7`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1C5	6837 bytes
Detection ClamAV: Heuristics.PDF.ObfuscatedNameObject Obfuscation or payload: unlikely

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